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Surface Area Calculator
Work out the surface area of six three dimensional solids with the formula shown for each one.
Calculate surface area
Surface area: — square units
Formula: —
How to use the Surface Area Calculator
- Choose the solid whose surface area you want to calculate.
- Enter the measurements the solid needs in the input boxes.
- Read the surface area and the formula that was applied.
Features
- Cube, box, cylinder and sphere
- Cone and square based pyramid
- Formula shown next to every result
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online surface area calculator.
You can measure cubes, rectangular boxes, cylinders, spheres, cones and square based pyramids
in any consistent unit.
A cube has six identical square faces, so its surface area is six times the side length
multiplied by itself.
A rectangular box uses twice the sum of length times width, width times height and height
times length.
A sphere uses four times pi times the radius squared, which is exactly four times the area of
its great circle.
The curved surface of a cone unrolls into a sector whose radius is the slant height, found
from the radius and height.
A square pyramid adds the square base to four triangular faces, using the base side and the
vertical height.
No. Every surface area is computed locally in your browser, so your measurements never leave
your device.
Enter all measurements in the same unit, and the answer is given in that unit squared, such
as square centimetres.
Last updated: October 10, 2026